I’ve just posted our ruby 1.9.1p129 src.rpm for CentOS/RHEL4. I’m
intentionally not posting binary packages, since many people will
probably want pthread support (enabled by default) but doing so breaks
tcltk support.
More info here:
http://labs.mudynamics.com/2009/06/10/ruby-191-package-for-centosrhel4/
Enjoy.